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+open Camlp4; (* -*- camlp4r -*- *)
+(****************************************************************************)
+(* *)
+(* Objective Caml *)
+(* *)
+(* INRIA Rocquencourt *)
+(* *)
+(* Copyright 1998-2006 Institut National de Recherche en Informatique et *)
+(* en Automatique. All rights reserved. This file is distributed under *)
+(* the terms of the GNU Library General Public License, with the special *)
+(* exception on linking described in LICENSE at the top of the Objective *)
+(* Caml source tree. *)
+(* *)
+(****************************************************************************)
+
+(* Authors:
+ * - Daniel de Rauglaudre: initial version
+ * - Nicolas Pouillard: refactoring
+ *)
+
+
+module Id : Sig.Id = struct
+ value name = "Camlp4OCamlRevisedParserParser";
+ value version = Sys.ocaml_version;
+end;
+
+module Make (Syntax : Sig.Camlp4Syntax) = struct
+ open Sig;
+ include Syntax;
+
+ type spat_comp =
+ [ SpTrm of Loc.t and Ast.patt and option Ast.expr
+ | SpNtr of Loc.t and Ast.patt and Ast.expr
+ | SpStr of Loc.t and Ast.patt ]
+ ;
+ type sexp_comp =
+ [ SeTrm of Loc.t and Ast.expr | SeNtr of Loc.t and Ast.expr ]
+ ;
+
+ value stream_expr = Gram.Entry.mk "stream_expr";
+ value stream_begin = Gram.Entry.mk "stream_begin";
+ value stream_end = Gram.Entry.mk "stream_end";
+ value stream_quot = Gram.Entry.mk "stream_quot";
+ value parser_case = Gram.Entry.mk "parser_case";
+ value parser_case_list = Gram.Entry.mk "parser_case_list";
+
+ value strm_n = "__strm";
+ value peek_fun _loc = <:expr< Stream.peek >>;
+ value junk_fun _loc = <:expr< Stream.junk >>;
+
+ (* Parsers. *)
+ (* In syntax generated, many cases are optimisations. *)
+
+ value rec pattern_eq_expression p e =
+ match (p, e) with
+ [ (<:patt< $lid:a$ >>, <:expr< $lid:b$ >>) -> a = b
+ | (<:patt< $uid:a$ >>, <:expr< $uid:b$ >>) -> a = b
+ | (<:patt< $p1$ $p2$ >>, <:expr< $e1$ $e2$ >>) ->
+ pattern_eq_expression p1 e1 && pattern_eq_expression p2 e2
+ | _ -> False ]
+ ;
+
+ value is_raise e =
+ match e with
+ [ <:expr< raise $_$ >> -> True
+ | _ -> False ]
+ ;
+
+ value is_raise_failure e =
+ match e with
+ [ <:expr< raise Stream.Failure >> -> True
+ | _ -> False ]
+ ;
+
+ value rec handle_failure e =
+ match e with
+ [ <:expr< try $_$ with [ Stream.Failure -> $e$] >> ->
+ handle_failure e
+ | <:expr< match $me$ with [ $a$ ] >> ->
+ let rec match_case_handle_failure =
+ fun
+ [ <:match_case< $a1$ | $a2$ >> ->
+ match_case_handle_failure a1 && match_case_handle_failure a2
+ | <:match_case< $pat:_$ -> $e$ >> -> handle_failure e
+ | _ -> False ]
+ in handle_failure me && match_case_handle_failure a
+ | <:expr< let $bi$ in $e$ >> ->
+ let rec binding_handle_failure =
+ fun
+ [ <:binding< $b1$ and $b2$ >> ->
+ binding_handle_failure b1 && binding_handle_failure b2
+ | <:binding< $_$ = $e$ >> -> handle_failure e
+ | _ -> False ]
+ in binding_handle_failure bi && handle_failure e
+ | <:expr< $lid:_$ >> | <:expr< $int:_$ >> | <:expr< $str:_$ >> |
+ <:expr< $chr:_$ >> | <:expr< fun [ $_$ ] >> | <:expr< $uid:_$ >> ->
+ True
+ | <:expr< raise $e$ >> ->
+ match e with
+ [ <:expr< Stream.Failure >> -> False
+ | _ -> True ]
+ | <:expr< $f$ $x$ >> ->
+ is_constr_apply f && handle_failure f && handle_failure x
+ | _ -> False ]
+ and is_constr_apply =
+ fun
+ [ <:expr< $uid:_$ >> -> True
+ | <:expr< $lid:_$ >> -> False
+ | <:expr< $x$ $_$ >> -> is_constr_apply x
+ | _ -> False ]
+ ;
+
+ value rec subst v e =
+ let _loc = Ast.loc_of_expr e in
+ match e with
+ [ <:expr< $lid:x$ >> ->
+ let x = if x = v then strm_n else x in
+ <:expr< $lid:x$ >>
+ | <:expr< $uid:_$ >> -> e
+ | <:expr< $int:_$ >> -> e
+ | <:expr< $chr:_$ >> -> e
+ | <:expr< $str:_$ >> -> e
+ | <:expr< $_$ . $_$ >> -> e
+ | <:expr< let $rec:rf$ $bi$ in $e$ >> ->
+ <:expr< let $rec:rf$ $subst_binding v bi$ in $subst v e$ >>
+ | <:expr< $e1$ $e2$ >> -> <:expr< $subst v e1$ $subst v e2$ >>
+ | <:expr< ( $tup:e$ ) >> -> <:expr< ( $tup:subst v e$ ) >>
+ | <:expr< $e1$, $e2$ >> -> <:expr< $subst v e1$, $subst v e2$ >>
+ | _ -> raise Not_found ]
+ and subst_binding v =
+ fun
+ [ <:binding@_loc< $b1$ and $b2$ >> ->
+ <:binding< $subst_binding v b1$ and $subst_binding v b2$ >>
+ | <:binding@_loc< $lid:v'$ = $e$ >> ->
+ <:binding< $lid:v'$ = $if v = v' then e else subst v e$ >>
+ | _ -> raise Not_found ];
+
+ value stream_pattern_component skont ckont =
+ fun
+ [ SpTrm _loc p None ->
+ <:expr< match $peek_fun _loc$ $lid:strm_n$ with
+ [ Some $p$ ->
+ do { $junk_fun _loc$ $lid:strm_n$; $skont$ }
+ | _ -> $ckont$ ] >>
+ | SpTrm _loc p (Some w) ->
+ <:expr< match $peek_fun _loc$ $lid:strm_n$ with
+ [ Some $p$ when $w$ ->
+ do { $junk_fun _loc$ $lid:strm_n$; $skont$ }
+ | _ -> $ckont$ ] >>
+ | SpNtr _loc p e ->
+ let e =
+ match e with
+ [ <:expr< fun [ ($lid:v$ : Stream.t _) -> $e$ ] >> when v = strm_n -> e
+ | _ -> <:expr< $e$ $lid:strm_n$ >> ]
+ in
+ if pattern_eq_expression p skont then
+ if is_raise_failure ckont then e
+ else if handle_failure e then e
+ else <:expr< try $e$ with [ Stream.Failure -> $ckont$ ] >>
+ else if is_raise_failure ckont then
+ <:expr< let $p$ = $e$ in $skont$ >>
+ else if pattern_eq_expression <:patt< Some $p$ >> skont then
+ <:expr< try Some $e$ with [ Stream.Failure -> $ckont$ ] >>
+ else if is_raise ckont then
+ let tst =
+ if handle_failure e then e
+ else <:expr< try $e$ with [ Stream.Failure -> $ckont$ ] >>
+ in
+ <:expr< let $p$ = $tst$ in $skont$ >>
+ else
+ <:expr< match try Some $e$ with [ Stream.Failure -> None ] with
+ [ Some $p$ -> $skont$
+ | _ -> $ckont$ ] >>
+ | SpStr _loc p ->
+ try
+ match p with
+ [ <:patt< $lid:v$ >> -> subst v skont
+ | _ -> raise Not_found ]
+ with
+ [ Not_found -> <:expr< let $p$ = $lid:strm_n$ in $skont$ >> ] ]
+ ;
+
+ value rec stream_pattern _loc epo e ekont =
+ fun
+ [ [] ->
+ match epo with
+ [ Some ep -> <:expr< let $ep$ = Stream.count $lid:strm_n$ in $e$ >>
+ | _ -> e ]
+ | [(spc, err) :: spcl] ->
+ let skont =
+ let ekont err =
+ let str =
+ match err with
+ [ Some estr -> estr
+ | _ -> <:expr< "" >> ]
+ in
+ <:expr< raise (Stream.Error $str$) >>
+ in
+ stream_pattern _loc epo e ekont spcl
+ in
+ let ckont = ekont err in stream_pattern_component skont ckont spc ]
+ ;
+
+ value stream_patterns_term _loc ekont tspel =
+ let pel =
+ List.fold_right
+ (fun (p, w, _loc, spcl, epo, e) acc ->
+ let p = <:patt< Some $p$ >> in
+ let e =
+ let ekont err =
+ let str =
+ match err with
+ [ Some estr -> estr
+ | _ -> <:expr< "" >> ]
+ in
+ <:expr< raise (Stream.Error $str$) >>
+ in
+ let skont = stream_pattern _loc epo e ekont spcl in
+ <:expr< do { $junk_fun _loc$ $lid:strm_n$; $skont$ } >>
+ in
+ match w with
+ [ Some w -> <:match_case< $pat:p$ when $w$ -> $e$ | $acc$ >>
+ | None -> <:match_case< $pat:p$ -> $e$ | $acc$ >> ])
+ tspel <:match_case<>>
+ in
+ <:expr< match $peek_fun _loc$ $lid:strm_n$ with [ $pel$ | _ -> $ekont ()$ ] >>
+ ;
+
+ value rec group_terms =
+ fun
+ [ [([(SpTrm _loc p w, None) :: spcl], epo, e) :: spel] ->
+ let (tspel, spel) = group_terms spel in
+ ([(p, w, _loc, spcl, epo, e) :: tspel], spel)
+ | spel -> ([], spel) ]
+ ;
+
+ value rec parser_cases _loc =
+ fun
+ [ [] -> <:expr< raise Stream.Failure >>
+ | spel ->
+ match group_terms spel with
+ [ ([], [(spcl, epo, e) :: spel]) ->
+ stream_pattern _loc epo e (fun _ -> parser_cases _loc spel) spcl
+ | (tspel, spel) ->
+ stream_patterns_term _loc (fun _ -> parser_cases _loc spel) tspel ] ]
+ ;
+
+ value cparser _loc bpo pc =
+ let e = parser_cases _loc pc in
+ let e =
+ match bpo with
+ [ Some bp -> <:expr< let $bp$ = Stream.count $lid:strm_n$ in $e$ >>
+ | None -> e ]
+ in
+ let p = <:patt< ($lid:strm_n$ : Stream.t _) >> in
+ <:expr< fun $p$ -> $e$ >>
+ ;
+
+ value cparser_match _loc me bpo pc =
+ let pc = parser_cases _loc pc in
+ let e =
+ match bpo with
+ [ Some bp -> <:expr< let $bp$ = Stream.count $lid:strm_n$ in $pc$ >>
+ | None -> pc ]
+ in
+ let me =
+ match me with
+ [ <:expr@_loc< $_$; $_$ >> as e -> <:expr< do { $e$ } >>
+ | e -> e ]
+ in
+ match me with
+ [ <:expr< $lid:x$ >> when x = strm_n -> e
+ | _ -> <:expr< let ($lid:strm_n$ : Stream.t _) = $me$ in $e$ >> ]
+ ;
+
+ (* streams *)
+
+ value rec not_computing =
+ fun
+ [ <:expr< $lid:_$ >> | <:expr< $uid:_$ >> | <:expr< $int:_$ >> |
+ <:expr< $flo:_$ >> | <:expr< $chr:_$ >> | <:expr< $str:_$ >> -> True
+ | <:expr< $x$ $y$ >> -> is_cons_apply_not_computing x && not_computing y
+ | _ -> False ]
+ and is_cons_apply_not_computing =
+ fun
+ [ <:expr< $uid:_$ >> -> True
+ | <:expr< $lid:_$ >> -> False
+ | <:expr< $x$ $y$ >> -> is_cons_apply_not_computing x && not_computing y
+ | _ -> False ]
+ ;
+
+ value slazy _loc e =
+ match e with
+ [ <:expr< $f$ () >> ->
+ match f with
+ [ <:expr< $lid:_$ >> -> f
+ | _ -> <:expr< fun _ -> $e$ >> ]
+ | _ -> <:expr< fun _ -> $e$ >> ]
+ ;
+
+ value rec cstream gloc =
+ fun
+ [ [] -> let _loc = gloc in <:expr< Stream.sempty >>
+ | [SeTrm _loc e] ->
+ if not_computing e then <:expr< Stream.ising $e$ >>
+ else <:expr< Stream.lsing $slazy _loc e$ >>
+ | [SeTrm _loc e :: secl] ->
+ if not_computing e then <:expr< Stream.icons $e$ $cstream gloc secl$ >>
+ else <:expr< Stream.lcons $slazy _loc e$ $cstream gloc secl$ >>
+ | [SeNtr _loc e] ->
+ if not_computing e then e else <:expr< Stream.slazy $slazy _loc e$ >>
+ | [SeNtr _loc e :: secl] ->
+ if not_computing e then <:expr< Stream.iapp $e$ $cstream gloc secl$ >>
+ else <:expr< Stream.lapp $slazy _loc e$ $cstream gloc secl$ >> ]
+ ;
+ (* Syntax extensions in Revised Syntax grammar *)
+
+ EXTEND Gram
+ GLOBAL: expr stream_expr stream_begin stream_end stream_quot
+ parser_case parser_case_list;
+ expr: LEVEL "top"
+ [ [ "parser"; po = OPT parser_ipatt; pcl = parser_case_list ->
+ cparser _loc po pcl
+ | "match"; e = sequence; "with"; "parser"; po = OPT parser_ipatt;
+ pcl = parser_case_list ->
+ cparser_match _loc e po pcl
+ ] ]
+ ;
+ parser_case_list:
+ [ [ "["; pcl = LIST0 parser_case SEP "|"; "]" -> pcl
+ | pc = parser_case -> [pc]
+ ] ]
+ ;
+ parser_case:
+ [ [ stream_begin; sp = stream_patt; stream_end; po = OPT parser_ipatt; "->"; e = expr ->
+ (sp, po, e) ] ]
+ ;
+ stream_begin:
+ [ [ "[:" -> () ] ]
+ ;
+ stream_end:
+ [ [ ":]" -> () ] ]
+ ;
+ stream_quot:
+ [ [ "`" -> () ] ]
+ ;
+ stream_expr:
+ [ [ e = expr -> e ] ]
+ ;
+ stream_patt:
+ [ [ spc = stream_patt_comp -> [(spc, None)]
+ | spc = stream_patt_comp; ";"; sp = stream_patt_comp_err_list ->
+ [(spc, None) :: sp]
+ | -> [] ] ]
+ ;
+ stream_patt_comp_err:
+ [ [ spc = stream_patt_comp; eo = OPT [ "??"; e = stream_expr -> e ] ->
+ (spc, eo) ] ]
+ ;
+ stream_patt_comp_err_list:
+ [ [ spc = stream_patt_comp_err -> [spc]
+ | spc = stream_patt_comp_err; ";" -> [spc]
+ | spc = stream_patt_comp_err; ";"; sp = stream_patt_comp_err_list ->
+ [spc :: sp] ] ]
+ ;
+ stream_patt_comp:
+ [ [ stream_quot; p = patt; eo = OPT [ "when"; e = stream_expr -> e ] -> SpTrm _loc p eo
+ | p = patt; "="; e = stream_expr -> SpNtr _loc p e
+ | p = patt -> SpStr _loc p ] ]
+ ;
+ parser_ipatt:
+ [ [ i = a_LIDENT -> <:patt< $lid:i$ >>
+ | "_" -> <:patt< _ >>
+ ] ]
+ ;
+ expr: LEVEL "simple"
+ [ [ stream_begin; stream_end -> <:expr< $cstream _loc []$ >>
+ | stream_begin; sel = stream_expr_comp_list; stream_end ->
+ <:expr< $cstream _loc sel$ >> ] ]
+ ;
+ stream_expr_comp_list:
+ [ [ se = stream_expr_comp; ";"; sel = stream_expr_comp_list -> [se :: sel]
+ | se = stream_expr_comp; ";" -> [se]
+ | se = stream_expr_comp -> [se] ] ]
+ ;
+ stream_expr_comp:
+ [ [ stream_quot; e = stream_expr -> SeTrm _loc e
+ | e = stream_expr -> SeNtr _loc e ] ]
+ ;
+ END;
+
+end;
+
+module M = Register.OCamlSyntaxExtension Id Make;